Reland "Add ExecuteJavaScriptForTest and make all tests use it"

chrome/browser/chromeos/login/lock/screen_locker_tester.cc

Index: chrome/browser/chromeos/login/lock/screen_locker_tester.cc
diff --git a/chrome/browser/chromeos/login/lock/screen_locker_tester.cc b/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
index 37efe024b017ab8e20ede1653da2b4b0211ed961..c3fc29b05b61cc051d7602584bf418be8f167275 100644
--- a/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
+++ b/chrome/browser/chromeos/login/lock/screen_locker_tester.cc
@@ -118,7 +118,7 @@ class WebUIScreenLockerTester : public ScreenLockerTester {
 };
 
 void WebUIScreenLockerTester::SetPassword(const std::string& password) {
-  webui()->GetWebContents()->GetMainFrame()->ExecuteJavaScript(
+  webui()->GetWebContents()->GetMainFrame()->ExecuteJavaScriptForTests(
       base::ASCIIToUTF16(base::StringPrintf(
           "$('pod-row').pods[0].passwordElement.value = '%s';",
           password.c_str())));